The phrase "and then maintained a" is correct and usable in written English.
It can be used when describing a continuous action or state that follows a previous action.
Example: "After the initial setup, the team and then maintained a steady workflow throughout the project."
Alternatives: "and subsequently upheld a" or "and then kept a".
Since then, Djokovic has sparked a national celebration by leading Serbia to its first Davis Cup title, sparked a raucous celebration in the locker room in Melbourne by winning the Australian Open and then maintained a much more even keel as he has crunched opponent after opponent, number after number.
The results indicated that VD decreased with the increasing conductivity and then maintained a certain value.
However, when the surface was covered with a thick corrosion product, the k value decreased down to 4 mV, and then maintained a constant value.
Based on analysis of chitin content, A. nidulans grew to be 4-5% of the total biomass in the culture after 2 days and then maintained a steady state of 4% of the total biomass for the next 12 days.
"Sylphides" starts with a tableau that springs to life (a favorite Balanchine device), and then maintains a tension between tableaus and movement.
Leonard's efforts to establish and then maintain a romantic relationship with Penny have constituted a major part of the narrative arc of the first three seasons.
The responsible baby boomer, frightened by Wall Street promoters and unduly cynical about receiving Social Security, came to regard a heavy commitment to stocks as crucial to any chance of prospering and then maintaining a decent standard of living in retirement.
Mr. Babbitt, who has spent his years out of government practicing law, writing and speaking for conservation, proposed that Mr. Obama should right the imbalance by permanently setting aside four million acres of public lands and then maintaining a one-to-one ratio of preserved land to land leased for oil and gas development.
Most SaaS companies don't have the resources to build a separate on-premises version and then maintain a code base for two versions, Miller explained to TechCrunch.
The implications of this for conservation management of the site are important, given the objective of restoring and then maintaining a natural ecological environment at the site.
The red to green intensity ratio is increased first and then maintain a certain range of ups and downs with the Tm3+ ions concentration increased.
